A QuotaWithin event follows a MessageExpunge event if the
messages purged reside inside a quota root, and amount to a number
or size that lowers the amount of resources used to below the
existing quota thresholds.

A QuotaWithin event follows a MessageMove event if the
source folder of the messages moved resides inside a quota root, and
the target folder to which the messages have been moved does not
reside within the same quota root, and the number or size of the
messages moves lowers the amount of resources used in the quota root
for the source folder of the messages to below the existing
quota thresholds.

A QuotaWithin event follows a QuotaChange event if the quota
change raised the threshold on the amount of resources used within
the quota root to a level higher than the existing amount of
resources used.

While Cyrus supports the Apple Push Service, Apple has only licensed Apple Push
for mail to a couple of large mail providers: FastMail and Yahoo. If you own an
OS X Server license, you also get a key for personal use. But it’s not
a supported option for third party developers at this time.

The ApplePushService event occurs when

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{"event":"ApplePushService","user":"john@example.org","apsVersion":"","apsAccountId":"","apsDeviceToken":"","apsSubtopic":"","mailboxes":"[array of mailboxIDs]"}